forked from MTSR/mapserver
45 lines
1019 B
Go
45 lines
1019 B
Go
package coords
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import (
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"math"
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)
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type TileCoords struct {
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X, Y int
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Zoom int
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}
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type TileQuadrants struct {
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UpperLeft, UpperRight, LowerLeft, LowerRight TileCoords
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}
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func NewTileCoords(x, y, zoom int) TileCoords {
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return TileCoords{X: x, Y: y, Zoom: zoom}
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}
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func (tc TileCoords) GetZoomedOutTile() TileCoords {
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return TileCoords{
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X: int(math.Floor(float64(tc.X) / 2.0)),
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Y: int(math.Floor(float64(tc.Y) / 2.0)),
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Zoom: tc.Zoom - 1}
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}
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func (tc TileCoords) GetZoomedQuadrantsFromTile() TileQuadrants {
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nextZoom := tc.Zoom + 1
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nextZoomX := tc.X * 2
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nextZoomY := tc.Y * 2
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upperLeft := TileCoords{X: nextZoomX, Y: nextZoomY, Zoom: nextZoom}
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upperRight := TileCoords{X: nextZoomX + 1, Y: nextZoomY, Zoom: nextZoom}
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lowerLeft := TileCoords{X: nextZoomX, Y: nextZoomY + 1, Zoom: nextZoom}
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lowerRight := TileCoords{X: nextZoomX + 1, Y: nextZoomY + 1, Zoom: nextZoom}
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return TileQuadrants{
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UpperLeft: upperLeft,
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UpperRight: upperRight,
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LowerLeft: lowerLeft,
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LowerRight: lowerRight,
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}
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}
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